A compressor comprising a sealed chamber delimited laterally by a shell, a drive shaft housed in the shell and guided relative to the other parts of the compressor via at least one bearing provided in a bearing support fixed to the internal wall of the shell. A mechanism for selectively attaches a handle to the post in either a left-handed orientation or a right-handed orientation relative to the trowel plane. The region information of each stamper is different according to the destination of contents information. A security control panel may also be connected to the local area network. The second insulating layer has a pattern, and has a material different from that of the first insulating layer. In particular, an example method determines reduced-width data values associated with generating and evaluating functions.